PDF Tools is a free add-on for Chrome that allows users to easily manipulate PDF documents right in their browser. With this add-on, users can convert, resize, merge, and perform other actions on PDF files without the need for external software.

PDF Tools utilizes the Ghostscript interpreter, an open-source software for interpreting PDF and postscript formats. To use the add-on, users must first download and install Ghostscript on their machine. The add-on then uses nativeMessaging technology to communicate with the Ghostscript client on the user's machine.

To enhance the add-on's functionality, users can also download and install the native client patch from the GitHub repository provided. This patch enables seamless communication between the PDF Tools add-on and the Ghostscript client on Windows, Linux, or Mac systems.

For any feature requests or bug reports, users can fill out the bug report form on the add-on's homepage.